" hey dad, I wanna date the girl next door what do you think?" Said the son, "no you can't!, don't tell this to your mom but, that girl is your sister" replied the father

Son: "What about the girl across the street". Dad:"unfortunately son, that is also your sister". Son: "how about the girl that works in the bakery down street". Dad: " I'm really sorry son but, she's also your sister".

So the son gets frustrated and, goes to his mom to complain about it.

Mom said: " don't worry about it son, he's not even your real father".